Bathtub



FIG. 1 is a top plan view of a bathtub showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a side elevational view;

FIG. 4 is a perspective view; and,

FIG. 5 is a sectional view taken along line 5—5 of FIG. 1.

The broken line showing of environmental support structure in FIGS. 2, 3 and 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bathtub, as shown and described. 